-F, --fixed-strings
Interpret PATTERN as a list of fixed strings, separated by newlines,
any of which is to be matched. (-F is specified by POSIX.)
-a, --text
Process a binary file as if it were text; this is equivalent to the
--binary-files=text option.
-o, --only-matching
Print only the matched (non-empty) parts of a matching line, with
each such part on a separate output line.
-b, --byte-offset
Print the 0-based byte offset within the input file before each line
of output. If -o (--only-matching) is specified, print the offset of
the matching part itself